If you want to get famous for being a musician, it helps to just love the music for itself. One mechanism is that you’ll reliably mistakenly devote too much of your resources to bad strategies for the real goal, worse than just investing in the straightforward subgoal (though it’s not clear why this would happen systematically). Another mechanism is that people might be trying to detect and filter for your actual goals, e.g. a politician might do better to actually care about good governance (or whatever) rather than their real goal of gaining power (or whatever) because people might be trying to avoid voting for power seekers.
If you want to get famous for being a musician, it helps to just love the music for itself. One mechanism is that you’ll reliably mistakenly devote too much of your resources to bad strategies for the real goal, worse than just investing in the straightforward subgoal (though it’s not clear why this would happen systematically). Another mechanism is that people might be trying to detect and filter for your actual goals, e.g. a politician might do better to actually care about good governance (or whatever) rather than their real goal of gaining power (or whatever) because people might be trying to avoid voting for power seekers.